title: Monoclonal antibody to human platelet glycoprotein I. II. Effects on human platelet function.
abstract: The effect on platelet function of a monoclonal platelet antibody to platelet membrane glycoprotein I was tested. This antibody, AN51, inhibited ristocetin or bovine factor VIII-induced aggregation but did not modify ADP, collagen type I or type III, thrombin or arachidonic acid induced aggregations. Furthermore, the adhesion-aggregation of platelets induced by microfibrils was also inhibited by the antibody. Platelet adhesion to rabbit aorta subendothelium was impaired by the antibody. The persistent adhesion of platelets to collagenase-treated subendothelium was also inhibited. These findings strongly suggested that platelet membrane glycoprotein I could interact with a non-collagenic microfibrillar component of subendothelium. The binding of factor VIII/von Willebrand factor to platelet membrane in the presence of ristocetin was decreased in the binding site for factor VIII/von Willebrand factor to allow platelet adhesion to subendothelium.
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology*; D000937:Antigen-Antibody Reactions; D001792:Blood Platelets / Q000276:immunology*; D003599:Cytoskeleton / Q000276:immunology; D005169:Factor VIII / Q000276:immunology; D006023:Glycoproteins / Q000276:immunology*; D006801:Humans; D007074:Immunoglobulin G / Q000276:immunology; D066298:In Vitro Techniques; D010973:Platelet Adhesiveness; D010974:Platelet Aggregation; D012310:Ristocetin / Q000276:immunology; D014841:von Willebrand Factor / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D006023:Glycoproteins; D007074:Immunoglobulin G; D014841:von Willebrand Factor; D012310:Ristocetin; D005169:Factor VIII